A gantry carries its own building, and all of it stands on ground you have to prepare. Eight on-site stages, wheel loads and rail sections from 5 to 100 tons, span and alignment tolerances, outdoor wind anchoring and clamp sizing, 2026 cost ranges, and the load test figures you have to hit before handover.
A gantry crane takes 10 to 30 working days to install once the ground is ready, and the part that decides whether it runs straight for fifteen years is not the crane. It is the rail under it. Rails and foundations typically run 20 to 60 percent of the crane price. Hold span within plus or minus 5 mm, keep each rail straight inside 10 mm over the full run, and budget USD 12,000 to 90,000 for erection, electrical, commissioning and load testing on a 5 to 50 ton unit.
This guide is written for the person who signs the installation contract and will be the one calling somebody back in eighteen months. Eight on-site stages and what each one actually costs in days. Why a gantry needs a real foundation while most overhead cranes do not. Wheel loads and rail sections. The alignment values from ISO 12488-1. What changes when the crane sits outdoors, because that is where gantries live and wind is the failure mode nobody budgets for. 2026 cost ranges, the faults that show up in year one, and the load test figures to hit before handover.
An overhead crane hangs off your building. A gantry crane carries its own building. The legs, sill beams and rail form the structure the bridge travels on, and all of it sits on ground you have to prepare. That single difference is why a gantry install has an extra half to it, and why the foundation quote arrives separately from the crane quote.
The scope splits cleanly into two contracts. The civil side is ground bearing, strip foundations or piling, rail beams, and drainage around the runway. The mechanical side is rail layout and alignment, leg and sill erection, the bridge lift, hoist and trolley, electrical, wind anchoring, and commissioning. On a 32 ton double girder gantry in a precast yard we commissioned last year, the civil contract finished at 41 percent of the crane price. On a 5 ton single girder unit in a covered bay, rail and slab work came to 19 percent. Both numbers are inside the same 20 to 60 percent band, and neither is unusual.
Where the split lands matters more than most buyers expect. If your crane supplier takes the whole scope including civil, you get one number and one throat to choke. If you split it, you get a cheaper civil contract and a very clear line about who owns rail alignment. Pick one and write it into the purchase order, because the argument that starts on day nine is always about who was supposed to check the rail.
Ten to thirty working days on site for a prepared rail-mounted unit. The number moves far more with the ground than with capacity. A 50 ton gantry on a finished concrete runway goes up faster than a 10 ton unit on gravel that needs a cast-in rail beam, mostly because the second one spends three weeks waiting on a civil crew.
| Stage | Typical duration | Usually done by |
|---|---|---|
| 1. Site survey, ground bearing check, travel path and clearance sweep | 0.5-1 day | Owner plus crane engineer |
| 2. Design approval, foundation plan, rail and wind anchoring specification | 5-15 days (office) | Crane supplier engineering |
| 3. Civil works: excavation, strip foundation, piling or rail beam casting and curing | 7-25 days | Civil contractor |
| 4. Rail delivered, laid, jointed or welded, aligned, clipped and grouted; end stops fitted | 2-5 days | Installation crew |
| 5. Legs and sill beams erected on the rail, wheelbase and gauge set | 1-3 days | Installation crew plus mobile crane |
| 6. Bridge lifted and bolted to the legs, diagonal and camber checked | 1-2 days | Installation crew plus mobile crane |
| 7. Trolley, hoist, festoon or cable reel, control panel, power supply | 2-5 days | Electrical crew |
| 8. Final alignment, wind anchoring commissioning, load test, handover | 1-3 days | Commissioning engineer |
Stages 1, 2 and 3 are where the calendar dies. Everyone plans for stage 5 and 6 and nobody plans for concrete curing, which is a week minimum before a rail beam can take wheel loads and longer in cold weather. If your schedule has the crane arriving on week three and the foundation being poured in week three, one of those two dates is fiction.
| Configuration | On-site days, ground ready | On-site days, ground not ready |
|---|---|---|
| Single girder gantry, 5-10 t, 12-20 m span | 8-14 days | 20-30 days |
| Double girder gantry, 16-32 t, 20-30 m span | 12-20 days | 28-45 days |
| Semi gantry, one leg on rail, one on a runway beam | 10-18 days | 22-35 days |
| Rubber-tyred gantry, no rail, prepared hardstanding | 6-12 days | 18-30 days |
| Double girder gantry, 50-100 t, port or heavy yard | 20-30 days | 40-70 days |
Yes, unless it runs on tyres. This is the single biggest difference from an overhead crane and the reason a gantry project carries a civil budget line. A rail-mounted gantry puts every wheel load, plus its own dead weight, plus wind, into a strip of ground a few hundred millimetres wide. Grass and compacted hardcore will not do it.
The design question is not whether you need a foundation but which of four arrangements fits your ground. Each has a different failure mode and a very different price.
| Support arrangement | Bearing requirement | Typical 2026 cost | Failure mode if underbuilt |
|---|---|---|---|
| Rail on existing reinforced slab | Slab 200 mm minimum, 25 MPa, wheels and rail clips anchored through to structure | USD 6,000-18,000 | Slab punching at wheel positions, anchor pull-out |
| Cast-in rail beam on strip foundation | Beam 400-600 mm wide, 300-500 mm deep, ground bearing 100-150 kPa | USD 14,000-45,000 | Differential settlement, rail settles out of span |
| Piled foundation for soft or fill ground | Piles to competent stratum, pile cap at each leg line | USD 35,000-120,000 | Progressive tilt, rail gauge opens over months |
| Ballast and sleeper runway | Crushed stone 300 mm compacted, sleepers at 600-750 mm centres | USD 8,000-25,000 | Track creep and loss of alignment, needs re-levelling yearly |
| Rubber-tyred hardstanding | Compacted base plus 150-200 mm concrete, gradients under 1 percent | USD 10,000-30,000 | Rutting and wheel path settlement, tyre scrubbing |
Two things get missed constantly. First, drainage. Water pooling next to a rail beam softens the subgrade and the rail starts moving in the second winter, not the first, so nobody connects the two. Second, the ground is almost never uniform along a 30 m runway. One end is old fill, the other is undisturbed clay, and the crane lifts at both ends. If a geotechnical report is not in the budget, put one there. It costs a few thousand dollars and it is the cheapest insurance on the whole project.
Rail size follows wheel load, not crane capacity on its own. A 32 ton gantry with four wheels carries about 8 tonnes per wheel in service, and a proof load test pushes that higher. Under-size the rail and it deforms, wears fast, and hammers the foundation beneath it, which is the expensive part to fix.
| Capacity | Crane dead weight (typical) | Max wheel load, service | Rail section |
|---|---|---|---|
| 5 t | 6-9 t | 85-115 kN | QU70 |
| 10 t | 11-16 t | 120-165 kN | QU70-QU80 |
| 16 t | 17-26 t | 165-240 kN | QU80 |
| 32 t | 34-52 t | 240-400 kN | QU100 |
| 50 t | 55-80 t | 380-580 kN | QU100-QU120 |
| 100 t and above | 110-160 t | 650-1,050 kN | QU120 or equivalent heavy section |
Ask your supplier for the wheel load drawing before the foundation design starts, not after. It is the input the civil engineer needs, and a supplier who cannot produce it in a week is a supplier who has not designed many gantries. If you substitute a lighter rail section to save money during procurement, the saving evaporates the first time somebody regrinds or replaces it, and the wheels usually pay for it too. On rail-mounted units the fix is quick to see and slow to pay for.
ISO 12488-1:2012 is the reference, and it is the identical text to GB/T 10183.1-2018. These are the values the crane was designed and built against, so a rail outside them is not a matter of opinion. They are extreme values, and elastic deflection under load is deliberately excluded from them.
| Item | Tolerance | How to measure it |
|---|---|---|
| Span, rail centre to rail centre | Plus or minus 5 mm up to 16 m; above 16 m use plus or minus [5 + 0.25 x (S - 16)] mm, capped at plus or minus 15 mm | Steel tape or total station at every 3 m station, both rails marked |
| Horizontal straightness of each rail, full length | Plus or minus 10 mm | Piano wire or laser along the rail side face, reading at 2 m intervals |
| Horizontal straightness over a 2 m test length | Plus or minus 1 mm | Straightedge and feeler gauge, checked at rail joints and welds above all |
| Height difference between the two rails at the same station | 0.001 x span, capped at plus or minus 10 mm | Level or total station on the rail head at matched stations across the runway |
| Vertical straightness of the rail head over a 2 m length | Plus or minus 2 mm | Straightedge on the rail head with feeler gauge, and a separate check at every joint |
| Rail joint step and side offset | 1 mm maximum, both vertical and lateral | Straightedge across the joint, feeler gauge; record it before rails are clipped down |
| Rail gauge, wheelbase and wheel squareness on the crane | Wheelbase plus or minus 2 mm; diagonal difference between wheel sets 5 mm maximum | Measure diagonals on the assembled sill beam before the bridge goes on |
My own habit is to get the installer to write the numbers into a table on site as they measure, not to report the finished job as "to tolerance". Once the rail is grouted down, the only person who can prove what the span was is the one holding the record. On a 30 m runway, a 6 mm span error is enough for the crane to bind and skew, and it shows up as flange wear on one side, not as an alarm. The same alignment discipline shows up later in the inspection and safety regime.
Wind. Almost every gantry crane lives outside, and an outdoor crane is a big flat sail with four small wheels holding it down. In 2023 a coastal port lost a 40 ton gantry crane that had been left unclamped at shift end; a 25 m/s gust slid it along the track until it derailed. That is the failure mode the wind anchoring system exists to prevent, and it is the one item most often left out of the tender because it is not part of the crane.
The calculation is fixed and there is no shortcut. Wind pressure times projected windward area gives the total wind force. Wheel-rail friction resists part of it. Whatever is left has to be taken by clamps, wedges or anchor pins.
| Item | Value | Note |
|---|---|---|
| Design wind pressure, working state | 150-250 Pa inland, 250-500 Pa coastal | Crane operating, load on the hook |
| Design wind pressure, non-working state | 500-800 Pa inland, 800-1,200 Pa coastal | 50 year return period. This is what sizes the anchoring |
| Design wind speed | 35 m/s inland, 42-45 m/s coastal, up to 55 m/s in typhoon zones | Check the local code before you accept a default |
| Worked case: 32 t gantry, 120 m2 windward area | 72,000 N working (about 7.3 t); 180,000 N non-working (about 18.4 t) | Friction coefficient 0.12 outdoor, so friction covers about 62 kN of the 180 kN |
| Manual rail clamps | 50-200 kN per clamp, CNY 2,000-5,000 each | Fine up to about 32 t where total demand stays under 100-200 kN |
| Powered clamps, electric or hydraulic | 100-800 kN per clamp, CNY 10,000-50,000 each | Standard from 50 t upward and in ports. Spring applied, power released |
| Anchor seats at track ends and mid runway | 500-2,000 kN holding force, CNY 5,000-15,000 per seat | Pin must enter at least 200 mm. Hoist and travel locked out while pinned |
| Wind wedges | 300-1,200 kN per wedge set, CNY 15,000-30,000 per set | Required from 13.8 m/s wind, minimum four per outdoor crane |
Sizing rule of thumb that people actually use on site: powered clamp capacity should land at 0.15 to 0.2 times crane dead weight. On a wet rail the friction coefficient drops, and wet conditions govern the design, which is why the numbers always look pessimistic on paper and correct in February.
One detail worth insisting on: fail-safe action. Clamps should be spring applied and power released, so losing power clamps the crane instead of releasing it, with a manual release handle as the backup. The clamp also needs to interlock with the gantry travel drive so the crane physically cannot move until every clamp confirms open. Without that interlock, an operator will eventually try to travel with a clamp closed and the result is a bent rail and a cracked clamp jaw.
Then there is the wind monitoring ladder. An anemometer at the highest point of the crane, two units if you want redundancy, feeding a controller that steps the machine down: normal operation below 15 m/s, reduced speed to 20 m/s, stop work to 25 m/s, automatic clamping and alarm above that. Ports extend it further, limiting hoist height above 13.8 m/s and sending the crane to its anchor position at crawling speed above 17 m/s. Calibrate the anemometer every six months inside plus or minus 0.5 m/s, because a wind sensor that reads 20 percent low is worse than no sensor at all.
Installation, electrical, commissioning and the civil work underneath. Published 2026 ranges put rails and foundations at 20 to 60 percent of the crane price, and that is the honest way to budget it, because the two numbers scale together. A cheap crane on an expensive foundation is still an expensive project.
| Cost item | Low | High | Comment |
|---|---|---|---|
| Engineering, drawings and load certificates | USD 2,000 | USD 12,000 | Wheel load drawings, foundation plan, wind calculation |
| Civil works, foundation and rail beam | USD 6,000 | USD 120,000 | Widest range of anything on this list. Ground conditions decide |
| Rail supply, fixing and alignment | USD 4,000 | USD 45,000 | Rail section, clips, joint plates, grout, alignment labour |
| Erection, legs, sill beams and bridge lift | USD 5,000 | USD 60,000 | Includes mobile crane hire, which often costs more than the crew |
| Electrical, control panel and power supply | USD 3,000 | USD 30,000 | Festoon or cable reel, transformer, switchgear, earthing |
| Wind anchoring hardware and commissioning | USD 3,000 | USD 60,000 | Clamps, anchor seats, wedges, anemometer and interlock |
| Commissioning, load test and documentation | USD 1,500 | USD 12,000 | Load test weights, test report, operator familiarisation |
Turn the items into installed totals and the picture gets clearer. These figures assume the ground is prepared and site access is reasonable. Add 20 to 40 percent for remote sites, restricted access or work that has to happen during a plant shutdown.
| Crane | Crane price, FOB | Installed on prepared ground | Includes civil works |
|---|---|---|---|
| 5 t single girder gantry, 12-16 m span | USD 22,000-38,000 | USD 34,000-62,000 | USD 48,000-95,000 |
| 10 t double girder gantry, 18-25 m span | USD 45,000-75,000 | USD 65,000-115,000 | USD 90,000-175,000 |
| 32 t double girder gantry, 22-30 m span | USD 95,000-160,000 | USD 130,000-240,000 | USD 175,000-360,000 |
| 50 t double girder gantry, rail mounted | USD 150,000-260,000 | USD 200,000-370,000 | USD 270,000-560,000 |
| 100 t double girder gantry, port duty | USD 280,000-460,000 | USD 370,000-650,000 | USD 520,000-1,050,000 |
Two patterns show up in these numbers. First, the ratio of installation to crane price falls as capacity rises, because the crane scales faster than the crew does. On a 5 ton unit, installation is 40 to 55 percent of the crane price. On 100 tons, it is closer to 30 to 40 percent. Second, the civil line is the one that moves. Everything else is a known quantity once the crane and rail are specified, and the ground is not. If you want a cleaner budget, spend the few thousand on a geotechnical report and a proper topographical survey of the runway before you ask for quotes. It changes the quotes, not just the cost. The wider cost and lifecycle picture is covered in the gantry crane cost and TCO guide.
Almost nothing is a crane defect. Looking back at the faults we have been called out to on gantry installations over the last three years, the pattern is consistent and it is nearly all either ground or alignment.
| First-year fault | Share of callouts | What it actually traces back to |
|---|---|---|
| Crane binds or skews during travel | About 30 percent | Span or gauge outside tolerance, wheelbase not square, one rail high across the runway |
| Abnormal wheel or rail flange wear on one side | About 20 percent | Rail straightness or joint step; a 1 mm step at a joint wears a wheel flange over months |
| Rail clip or anchor bolts working loose | About 15 percent | Wrong torque, holes not cleaned, chemical anchors loaded before full cure |
| Rail settling or losing level after one wet season | About 12 percent | Drainage missing, subgrade softened by standing water, fill that was never proven |
| Crane creeps on the rail in wind | About 12 percent | Clamping sized against working wind pressure instead of non-working pressure |
| Travel drive overloads and trips | About 11 percent | Skew load from geometry, not a motor problem. Fix the rail and the trip goes away |
The wind creep one is worth a sentence more, because it is the cheapest to get wrong and the most expensive to suffer. Clamps sized against working wind pressure instead of the non-working 50 year figure look generous on paper and fail in the first storm. If your tender document says "wind clamps as required" and nothing else, that is the gap.
OSHA 29 CFR 1910.179 and ASME B30.2 both require a rated load test before initial use, and both cap the static test at 125 percent of rated load unless the manufacturer says otherwise. The report goes on file where the responsible person can reach it. That last clause matters more than it sounds, because the person who needs it is usually an inspector three years later.
| Test | Load applied | What it proves |
|---|---|---|
| Static, proof load | 125 percent of rated load, held with the load clear of the ground | Structure, legs, bridge, rail and foundation take the overload without permanent set |
| Dynamic, operational | 110 percent of rated load, all motions through their full range | Hoist, trolley, gantry travel, brakes and limits work loaded |
| Rail and flange check after the static test | Same load, crane traversed along the full runway | Rail alignment holds under load and the foundation does not move |
| End stop and buffer impact | Rated load at 50 percent of travel speed | Buffers and stops absorb the hit without transferring it into the structure |
| Wind interlock and clamp function | No load, simulated wind signal | Clamps close on signal, travel locks out while clamped, manual release works |
| Rated capacity | Static test load, 125 percent | Dynamic test load, 110 percent |
|---|---|---|
| 5 t | 6.25 t | 5.5 t |
| 10 t | 12.5 t | 11.0 t |
| 16 t | 20.0 t | 17.6 t |
| 32 t | 40.0 t | 35.2 t |
| 50 t | 62.5 t | 55.0 t |
| 100 t | 125 t | 110 t |
Where does the test load come from? Water bags, test weights or calibrated steel. On gantry projects the practical constraint is usually getting 40 tonnes of anything to the site, which costs real money and takes a day of its own. Price it into the tender instead of discovering it during commissioning. The crane also has to be re-tested after any modification or rerating, and the new rated load displayed on the bridge, so a capacity upgrade is not a paperwork exercise.
Ten items. Get the installer to hand over the numbers as well as the machine, and keep the file with the crane rather than in an office drawer.
Photograph items 2, 4 and 7 as they are done. Once the rail is grouted down, those photographs and the recorded numbers are the only evidence you will have in year three when somebody asks why the crane started skewing. If you want a second opinion before you commit, our engineers review runway layouts, foundation loads and wind anchoring requirements, and we issue the wheel load drawings your civil engineer needs before the order is placed. You can see the gantry crane range for capacities, spans and rail options, compare yard arrangements in the precast yard guide, or go deeper on the standards and certification side.
Ten to thirty working days on site for a rail-mounted unit on prepared ground. A 5 to 10 ton single girder gantry takes 8 to 14 days and a 32 ton double girder gantry takes 12 to 20 days. The variable is the ground. If a cast-in rail beam still has to be poured, cured and then aligned, add two to three weeks, most of it waiting on concrete rather than on the crane crew. Rubber-tyred units skip the rail entirely and finish faster.
Yes if it runs on rails, and it is the largest single line in the project budget. Wheel loads run from 85 to 115 kN on a 5 ton gantry to 380 to 580 kN on a 50 ton unit, and the design has to take non-working wind load as well as the crane's own weight. Ground bearing for a strip foundation is typically 100 to 150 kPa. Check the gantry crane product range for your capacity, then have a geotechnical report done before the foundation design starts.
ISO 12488-1:2012, identical to GB/T 10183.1-2018. Span within plus or minus 5 mm up to 16 m, and above that plus or minus [5 + 0.25 x (S - 16)] mm capped at plus or minus 15 mm. Each rail straight within 10 mm over full length and 1 mm over any 2 m test length. Height difference between the two rails at the same station limited to 0.001 x span capped at 10 mm. Rail joint step and side offset 1 mm maximum. You can see the standards framework laid out in the gantry crane standards guide.
Installation on prepared ground runs USD 12,000 to 90,000 depending on capacity, and civil works add USD 6,000 to 120,000. Complete projects including foundations land at USD 48,000 to 95,000 for a 5 ton gantry, USD 175,000 to 360,000 for a 32 ton unit, and USD 520,000 to over 1 million for a 100 ton port-duty machine. Rails and foundations alone account for 20 to 60 percent of the crane price, so budget them together with the crane, not separately.
Static proof load at 125 percent of rated load with the load held clear of the ground, then dynamic operation at 110 percent through the full range of motions. OSHA 29 CFR 1910.179 and ASME B30.2 both require it before initial use, and the test report must be filed where the responsible person can reach it. The crane is then traversed along the full runway at the test load to confirm that rail alignment and the foundation hold up. Rail rerating or any modification triggers a retest.
Wind anchoring, and nothing else comes close in importance. An outdoor crane is designed for a non-working wind pressure of 500 to 800 Pa inland and 800 to 1,200 Pa coastal, against a working pressure roughly half that. A 32 ton gantry with 120 m2 of windward area sees about 180 kN of non-working wind force, and wheel friction covers only around 62 kN of it. The remainder has to be taken by rail clamps clipped to a fail-safe interlock, anchor seats at the track ends, or wind wedges from 13.8 m/s. Sizing clamps against working wind pressure is the most expensive mistake on the list.
Send us your runway layout, ground conditions and lifting requirement. Our engineering team will confirm the capacity, span and rail section that fits, issue the wheel load and foundation drawings your civil engineer needs, set out the rail alignment tolerances your installer must hold, and price the wind anchoring for your wind zone so nothing falls between contracts.
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